I actually just tried this to see if it would be even remotely feasible, and I'm afraid it's not likely. Even on a 20Mbps package (reading 15 down on speedtest.net), my latency through Teamviewer is just too high to be enjoyable/playable.

I really hope this game sells like hotcakes after launch, it deserves online co-op so much. :D

Thank you very much for testing this!
Sucky that it doesn't work.. but I'd imagine the creators of this amazing game wouldn't want us doing it that way anyway.
Yeah.. I really want to see online co-op.
This game sadly will never have it I hear, but the next game they make probably will!